Air filter cartridge



FIG. 1 is a perspective view of an air filter cartridge showing my new design;

FIG. 2 is a top plan view thereof, the bottom plan view being a mirror image;

FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image; and,

FIG. 4 is a right side elevational view thereof, the opposite side being a mirror image. 

The ornamental design for an air filter cartridge, as shown and described. 